Ultraviolet Absorbing Layer for Display Panel Lifespan

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Solution Overview

Problem

The replacement of polarizers with a color filter and black matrix in display panels improves light extracting rate but leads to color deviation and a short lifespan due to high ultraviolet light transmittance.

Innovation Solution

A display panel design featuring a color filter layer with black matrices and an ultraviolet absorbing layer with a network crosslinking structure and dispersed ultraviolet absorbers, which effectively absorbs ultraviolet light and reduces its impact on the organic light emitting layer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a polarizer is used in the display panel, then reflectivity is reduced under bright light, but light extracting rate decreases by nearly 58%

Engineering Contradiction:

ImprovereflectivityVSAvoidlight extracting rate

Core Design Contradiction:

Object-affected harmful factorsVSLoss of energy

Solution Approach 1:

The patent divides the protective layer into multiple functional segments: a polarizer layer for reducing reflectivity and an ultraviolet absorbing layer for protecting the organic light emitting layer. This segmentation allows each layer to specialize in one function, resolving the contradiction between reflectivity reduction and light extracting rate maintenance.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces an ultraviolet absorbing layer as an intermediary between the color filter layer and the organic light emitting layer. This intermediary layer selectively absorbs harmful ultraviolet light while allowing visible light to pass through, thus protecting the organic light emitting layer without significantly reducing the light extracting rate.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If a polarizer is used in the display panel, then reflectivity is reduced, but the panel thickness increases and brittleness increases

Engineering Contradiction:

ImprovereflectivityVSAvoidpanel thickness

Core Design Contradiction:

Object-affected harmful factorsVSLength of stationary object

Solution Approach 1:

The patent employs thin film technology for the ultraviolet absorbing layer, which is formed as a thin coating on the color filter layer. This thin film approach maintains the overall panel thickness while providing the necessary ultraviolet protection, avoiding the thickness increase associated with traditional polarizer-based solutions.

Inventive Principle:

Principle #30Flexible shells and thin films

3Loss of energy

If the polarizer is replaced with a color filter and black matrix, then light extracting rate increases from 42% to 60%, but color deviation and short lifespan occur

Engineering Contradiction:

Improvelight extracting rateVSAvoidlifespan

Core Design Contradiction:

Loss of energyVSReliability

Solution Approach 1:

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent uses a composite structure combining the color filter layer and the ultraviolet absorbing layer. The color filter layer provides color filtering and high visible light transmittance, while the ultraviolet absorbing layer provides ultraviolet protection. This composite material approach achieves both high light extracting rate and extended lifespan.

Inventive Principle:

Principle #40Composite materials

4Loss of energy

If the polarizer is replaced with a color filter and black matrix, then light extracting rate increases, but color deviation occurs

Engineering Contradiction:

Improvelight extracting rateVSAvoidcolor accuracy

Core Design Contradiction:

Loss of energyVSManufacturing precision

Solution Approach 1:

The patent applies the ultraviolet absorbing layer selectively on the color filter layer, creating local quality differentiation. The ultraviolet absorbing layer is positioned specifically where ultraviolet protection is needed, while the color filter layer maintains its color filtering properties in the visible range. This local quality approach prevents color deviation while achieving ultraviolet protection.

Inventive Principle:

Principle #3Local quality

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution enhances the light extracting rate, reduces power consumption, and significantly prolongs the service life of the display panel by minimizing ultraviolet light damage, while maintaining high visible light transmittance.

Implementation Method 1

the ultraviolet absorber comprises one or more of a benzotriazole-based compound, an o-hydroxybenzophenone-based compound, a salicylate-based compound, a triazine-based compound, or a substituted acrylonitrile-based compound

Methodology Applied

Scientific EffectUltraviolet absorption: Absorption (EM radiation)

Implementation Method 2

the ultraviolet absorbing layer comprises a network crosslinking structure and an ultraviolet absorber dispersed within the network crosslinking structure

Methodology Applied

Scientific EffectCrosslinking: Chemical Bonding

Data Source

PatentUS12310221B2Display panel and mobile terminal

Publication Date: 2025.05.20 WUHAN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO LTD

AI summary

The present application discloses a display panel and a mobile terminal. The display panel includes a display functional body, a color filter layer, and an ultraviolet absorbing layer. The ultraviolet absorbing layer is disposed on a side of the color filter layer away from the display functional body. The ultraviolet absorbing layer includes a network crosslinking structure and an ultraviolet absorber dispersed within the network crosslinking structure. This solution may reduce influence of ultraviolet rays on organic light emitting layers, and effectively prolong the service life of the display panel.